KR20170083214A - Apparatus for Measuring Generation Amount of Inner Gas Using Coin Cell - Google Patents

Abstract

The present invention relates to an apparatus for measuring the amount of internal gas generated by using a coin cell, and more particularly to an apparatus for measuring the amount of internal gas generated by a coin cell, Two or more coin cells having apertures perforated in a part of the battery case so that gas can be discharged; A first jig having indentations corresponding to an outer shape of the coin cells so that the coin cells are mounted, the indentations having a first gas transfer path for the movement of the gas; A second jig coupled to the first jig for sealing the coin cells mounted on the first jig and having a second gas pathway communicating with the first gas pathway of the indentations; A gas sensor positioned at an end of the second gas passage and measuring the pressure of the gas; And a heating chamber for heating the first and second jigs to discharge the internal gas of the coin cells.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for measuring an internal gas generation amount using a coin cell,

The present invention relates to an apparatus for measuring an internal gas emission amount using a coin cell.

BACKGROUND ART [0002] In recent years, rechargeable secondary batteries have been widely used as energy sources for wireless mobile devices. In addition, the secondary battery is attracting attention as an energy source for electric vehicles, hybrid electric vehicles, and the like, which is proposed as a solution for air pollution in existing gasoline vehicles and diesel vehicles using fossil fuels. Therefore, the types of applications using secondary batteries are diversifying due to the advantages of secondary batteries, and it is expected that secondary batteries will be applied to many fields and products in the future.

Such a secondary battery may be classified as a lithium ion battery, a lithium ion polymer battery, or a lithium polymer battery depending on the configuration of an electrode and an electrolytic solution. The amount of the lithium ion polymer battery Is growing.

In general, the secondary battery may be operated in an abnormal state due to overcharging, overdischarging, overheating, external impact, or the like, and gas may be generated therein. For example, the overheated battery generates gas and the gas pressurized in the case further accelerates the decomposition reaction of the battery element, causing continuous overheating and gas generation, and swelling may occur. This phenomenon occurs even in the course of a gradual deterioration of the secondary battery due to long-term use.

1 is a schematic diagram for measuring the swelling phenomenon of a conventional secondary battery.

1, a conventional thickness measuring apparatus 10 includes a battery cell 30 mounted on a base 13 and a sensor 20 mounted on the battery cell 30 ) Is measured.

As described above, in the evaluation of the swelling phenomenon of the conventional secondary battery, it is necessary to test the secondary battery at the material development stage, which is the stage prior to development of the product. However, since the samples for testing are to be manufactured in full cell size, There is a problem that it is consumed a lot.

In addition, there is a problem that it is difficult to evaluate all the causes of the swelling phenomenon by evaluating only some samples due to manufacturing period and manufacturing cost problems.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

Specifically, the object of the present invention is to solve the problem of the swelling phenomenon of the secondary battery. By measuring the amount of gas generated by each material in units of coin cells, it is possible to simplify the evaluation method for all causes of the swelling phenomenon And an internal gas generation amount measurement device capable of performing the gas generation amount measurement evaluation.

In order to attain the above object, according to the present invention, there is provided an apparatus for measuring an internal gas generation amount using a coin cell, the coin-shaped electrode assembly being housed in a battery case, Two or more coin cells having openings formed in a part of the battery case so that generated gas can be discharged; A first jig having indentations corresponding to an outer shape of the coin cells so that the coin cells are mounted, the indentations having a first gas transfer path for the movement of the gas; A second jig coupled to the first jig for sealing the coin cells mounted on the first jig and having a second gas pathway communicating with the first gas pathway of the indentations; A gas sensor positioned at an end of the second gas passage and measuring the pressure of the gas; And a heating chamber for heating the first and second jigs to discharge the internal gas of the coin cells.

That is, in order to solve the problem of the swelling phenomenon of the battery cell, the internal gas generation amount measuring device using the coin cell according to the present invention is characterized in that, in order to measure the amount of gas generation by material in units of coin cells, It is possible to simplify the evaluation method for all the causes that cause the phenomenon, and to perform the gas emission measurement evaluation.

According to the present invention, the coin cell may include a coin full cell, a coin half cell, and a dummy cell.

In this case, the coin pull cell may have a structure in which an anode, a cathode, and an electrolyte are housed.

Also, the coin half cell may include a full cell full half cell and a full discharge coin half cell.

In this case, the coin half cell may have a structure in which a positive electrode or a negative electrode is accommodated together with an electrolyte solution.

According to the present invention, the dummy cell may have a structure in which an aluminum foil having an electrode thickness is housed, and is not limited as long as it has a similar thickness.

In one specific example, the indentations of the first jig are arranged in m rows by n columns, and m and n may be independently of one another a natural number of 1 to 5.

In other cases, the indentations of the first jig may be three to ten, and may be arranged in a circular shape with respect to the center of the first jig in a plane.

According to the present invention, the first gas moving path may have a dendritic structure communicating with the respective indentations in a plane.

In this case, the resinous structure of the first gas passage may be a structure in which the gases generated from the indentations at the center are collected in a plane.

In the above structure, grooves for mounting the gasket may be formed on the first and second jigs along the outer periphery thereof so as to prevent gas generated in the indentations from flowing out.

In addition, the second gas moving path may be formed in a structure in which the gas inlet communicates with the first gas moving path of the first jig and the gas outlet is located on the outer surface of the second jig.

In this structure, the second gas moving path may be formed in a structure vertically penetrating the second jig.

For example, the heating temperature of the heating chamber may be in the range of 40 占 폚 to 120 占 폚, preferably 50 占 폚 to 115 占 폚, and more preferably 70 占 폚 to 110 占 폚.

According to the present invention, the apparatus may further comprise a gas valve for controlling gas movement between the gas sensor and the top of the second gas path of the second jig.

For example, the apparatus may further include a controller for calculating a pressure change and a gas generation amount according to the signal from the signals received from the gas sensor.

The present invention also provides a battery cell manufactured on the basis of an internal gas generation amount of a coin cell.

The present invention also provides a battery pack including a battery cell as a unit battery.

The present invention also provides a device including a battery pack.

The device may be a computer, a mobile phone, a wearable electronic device, a power tool, an electric vehicle (EV), a hybrid electric vehicle, a plug-in hybrid electric vehicle, a motorcycle, And the like.

The structure and manufacturing method of such a device are well known in the art, so a detailed description thereof will be omitted herein.

INDUSTRIAL APPLICABILITY As described above, the internal gas generation amount measuring apparatus using the coin cell according to the present invention can perform the gas generation amount measurement evaluation by simplifying the evaluation method for all causes of the swelling phenomenon in the battery cell development step.

Further, it is possible to provide a battery cell that solves the problems caused by the swelling phenomenon based on the inspection result of the internal gas generation amount measuring device using the coin cell, thereby providing the performance and safety of the battery cell.

1 is a schematic diagram for measuring the swelling phenomenon of a conventional secondary battery;
2 is a schematic diagram of an apparatus for measuring internal gas generation using a coin cell according to an embodiment of the present invention;
Figure 3 is a schematic diagram of a first jig mounting the coin cells and coin cells of Figure 2;
4 is a schematic view of the second jig of Fig. 2;
Figure 5 is a perspective view of the first and second jigs of Figures 2 to 4;
6 is a graph showing test results of coin cells of different configurations;
FIG. 7 is a graph showing the results of the gas generation amount test of the cathode material according to the voltage difference;
8 is a flow chart showing the result of the test of the amount of gas generated between the cathode active materials.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

FIG. 2 is a schematic diagram of an apparatus for measuring an internal gas emission amount using a coin cell according to an embodiment of the present invention.

Referring to FIG. 2, the internal gas generation amount measuring apparatus 100 includes at least two coin cells 110 having apertures perforated in a part of a battery case, a first jig 130 on which the coin cells 110 are mounted, A gas sensor 170 for measuring the pressure of the coin cells 110 and a heating chamber 190 for heating the first and second jigs 130 and 150, .

The coin cells 110 are respectively seated in the indentations 133 of the first jig 130 and the first gas passage 135 is formed in the coin cells 110 ) Are collected.

Between the first jig 130 and the second jig 150, there is mounted a gasket 180 for preventing gas generated in the coin cells 110 from flowing out to a portion other than the designed gas moving path.

A gas valve 175 is attached between the upper part of the second gas moving path 155 of the second jig 150 and the gas sensor 170 to control gas movement.

Fig. 3 shows a top view and a side view of the first jig mounting the coin cells and coin cells of Fig.

3, the coin cells 110 include a coin pull cell 111, coin half cells 113, and a dummy cell 116, and the coin half cell 113 includes a half- A cell 114 and a half cell 115 which is a discharge coin.

The coin cells 110 are respectively seated in the indentations 133 of the first jig 130. The four indentations 133 of the first jig 130 are arranged at regular intervals with respect to the center of the first jig 130 in two rows by two columns and the centers of the indentations 133 are arranged at the center of the first jig 130, (Not shown).

The first gas transfer path 135 has a resin-like structure communicating with the respective indentations 133 in plan view. The communication structure of the first gas moving path 135 is centered in a plane and gasses generated in the coin cells 110 accommodated in the respective indentations 133 are gathered.

A gasket (see FIG. 2: 180) is formed on the upper surface of the first jig 130 along the outer periphery of the first jig 130 so as to prevent the gas generated from the indentations 133 from flowing out to a portion other than the designed gas- A groove 139 is formed for mounting the light emitting diode chip.

Fig. 4 shows a top view and a side view of the second jig of Fig.

Referring to FIG. 4 together with FIG. 2 and FIG. 3, the second jig 150 is structured to engage with the first jig (FIG. The second jig 150 is provided with a gasket (see FIG. 2) 180 along the periphery thereof so as to prevent the gas generated at the indentations 133 of the first jig 130 from flowing out to a portion other than the designed gas- A groove 159 for mounting is formed.

The second gas moving path 155 is opened so that the gas inlet 156 communicates with the first gas moving path of the first jig (Fig. 3: 130) (Fig. 3: 135) and the gas discharging port 157 communicates with the second jig 150 and vertically penetrates the second jig 150. The second jig 150 is formed to have a substantially rectangular shape.

A gas sensor 170 for measuring the pressure of gas is attached to the gas discharge port 157 of the second gas moving path 155 of the second jig 150.

The first jig 130 and the second jig 150 are provided with a groove for mounting the gasket 180 along the outer periphery of the first jig 130 and the second jig 150 so as to prevent the gas generated from the indentations 133 from flowing out to a portion other than the designed gas- Respectively, are formed.

Fig. 5 is a perspective view of the first and second jigs shown in Figs. 2 to 4. Fig.

Referring to FIG. 5, there is shown a perspective view showing the coupling relationship of the shapes of the first jig 130 and the second jig 150 corresponding to each other, as described above. A groove 139 for mounting a gasket (FIG. 2) 180 is formed around the circular depressions 133 on the plane of the first jig 130. Thus, the gas generated in the coin cells (FIG. 2: 110) flows through the first and second gas travel paths 135, 155 of the first and second jigs 130, 150.

6 is a graph showing test results of coin cells of different configurations.

Referring to FIG. 6, the coin cell includes a coin pull cell, a coin half cell, and a dummy cell. The coin pull cell contains an anode, a cathode, and an electrolytic solution. The coin half cell is composed of a full charge coin half cell and a full discharge coin half cell, and the coin half cell has a structure in which an anode and an electrolyte are housed. The dummy cell houses an aluminum foil having an electrode thickness.

The lines shown by solid lines represent a coin pull cell, a full charge coin half cell, a full discharge coin half cell, and a dummy cell in order from the top.

Each of the coin cells was mounted on a jig and heated in a heating chamber at 90 DEG C for 5 hours, and the amount of generated gas and the type of gas generated through the difference between the coin cells are shown in Table 1 below. The amount of gas generated by the constituent material can be quantified.

Pressure (bar, @ 5h, 90 ℃) Δ pressure (bar, @ 5h, 90 ° C) Remarks Coin pull cell 1.34 0.37 (28%) Cathode gas Full Coin Half Cell 0.97 0.25 (19%) Anode gas Melee coin half cell 0.72 0.28 (12%) Electrolyte volatility Dummy cell 0.44 0.44 (33%) Dead space in the jig

Fig. 7 is a graph showing the results of the gas generation amount test of the cathode material according to the voltage difference.

Referring to Fig. 7, there is shown a test result of the gas generation amount of the cathode material according to the voltage. As in the previous test, the graph of FIG. 7 shows a state in which each coin cell is mounted on a jig and heated in a heating chamber at 90 DEG C for 5 hours.

The test was carried out at different voltages of 4.4 V and 4.5 V in the state where the cathode material according to the voltage was housed in the heating chamber. Among the lines indicated by the solid line in the graph, when the voltage was 4.5 V from the top, And is shown in the graph of FIG. 7 and the following Table 2, and the gas generation amount of the cathode material according to the voltage difference can be known.

Active matter (mg) Δ pressure (@ 5h, 90 ° C) 4.4V 26 0.92 4.5V 26 1.08

As a result, it can be seen that the 11% gas generation amount is increased when the voltage is higher at 4.5V.

FIG. 8 is a flow chart showing the results of the test of the amount of generated gas between the cathode active materials.

Referring to FIG. 8, a test was performed at 4.5 V, which is the same voltage, in order to show the test results of the amount of gas generated between the cathode active materials, and is shown in the graph of FIG. 8 and the following Table 3.

Active matter (mg) Δ pressure (@ 5h, 90 ° C) 1) Sample # 1 26 0.92 2) Sample # 2 26 1.08 3) Sample # 3 26 0.98 4) Sample # 4 26 0.90 5) Sample # 5 26 1.08

As in the table, the tests were carried out with the five active materials 1) to 5), and the actual liquid amount and the active material amount were similar but were similar.

2) Sample # 2 and 5) Sample # 5 show relatively equal pressure and the solid lines below the lines are in order 3) Sample # 3, 1) Sample # 1 and 4 ) Sample # 4 pressure.

2) Sample # 2 and 5) The pressure of Sample # 5 is higher than that of other materials. Therefore, it can be seen that excellent quality can not be obtained at actual high temperature because the pressure is high and the gas generation amount is large.

On the contrary, it can be seen that the pressure is low in 1) Sample # 1 and 4) Sample # 4 because the pressure is lower than other materials and the gas generation amount is small, so that excellent quality can be obtained at actual high temperature.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (19)

An apparatus for measuring an internal gas generation amount using a coin cell,
At least two coin cells in which a coin shaped electrode assembly is housed in a battery case and an opening is drilled in a part of the battery case so that gas generated therein can be discharged;
A first jig having indentations corresponding to an outer shape of the coin cells so that the coin cells are mounted, the indentations having a first gas transfer path for the movement of the gas;
A second jig coupled to the first jig for sealing the coin cells mounted on the first jig and having a second gas pathway communicating with the first gas pathway of the indentations;
A gas sensor positioned at an end of the second gas passage and measuring the pressure of the gas; And
A heating chamber for heating the first and second jigs to discharge the internal gas of the coin cells;
And an internal gas discharge amount measuring device for measuring an internal gas discharge amount of the coin cell. The coin cell according to claim 1, wherein the coin cell includes a coin full cell, a coin half cell, and a dummy cell. . [3] The apparatus of claim 2, wherein the coin pull cell comprises a positive electrode, a negative electrode, and an electrolytic solution. 3. The apparatus according to claim 2, wherein the coin half cell includes a full cell half cell and a half discharge coin half cell. The coin cell according to claim 4, wherein the coin half cell has a structure in which a positive electrode or a negative electrode is accommodated together with an electrolytic solution. The apparatus according to claim 3, wherein the dummy cell has a structure in which an aluminum foil having an electrode thickness is accommodated. The apparatus according to claim 1, wherein the indentations of the first jig are arranged in m rows by n columns, and m and n are natural numbers of 1 to 5 independently of each other. 2. The apparatus according to claim 1, wherein the number of the indentations of the first jig is 3 to 10, and the first jig is arranged in a circular shape with respect to the center of the first jig. The apparatus according to claim 1, wherein the first gas moving path has a dendritic structure communicating with the respective indentations in plan view. 10. The apparatus according to claim 9, wherein the resinous structure of the first gas transfer path is a structure in which the gases generated from the indentations at the center are gathered in a plane. The coin cell according to claim 1, wherein a groove for mounting a gasket is formed in the first and second jigs so as to prevent gas generated in the indentations from flowing out. Apparatus for measuring gas emission. The coin cell according to claim 1, wherein the second gas moving path is formed in a structure in which the gas inlet communicates with the first gas moving path of the first jig and the gas outlet is located on the outer surface of the second jig. Of the internal gas. 13. The apparatus according to claim 12, wherein the second gas moving path is formed in a structure vertically penetrating the second jig. The apparatus according to claim 1, wherein the heating temperature of the heating chamber is in a range of 40 to 120 占 폚. The apparatus of claim 1, wherein the apparatus further comprises a gas valve for controlling gas movement between an upper portion of the second gas path of the second jig and the gas sensor. 2. The apparatus of claim 1, wherein the apparatus further comprises a control unit for calculating a pressure change and a gas generation amount according to a signal from the signals received from the gas sensor. A battery cell characterized in that it is manufactured based on an internal gas generation amount of a coin cell measured by the apparatus according to claim 1. 18. A battery pack comprising a battery cell according to claim 17 as a unit cell. A device comprising a battery pack according to claim 18.

Images